Read e-book online LINQ : Language Integrated Query en C# 2008 PDF

By Jr. Joseph C. Rattz

LINQ is the venture identify for a suite of extensions to the .NET Framework that supply a favourite method of querying facts from various facts resources. LINQ will finest in visible Studio 2008, and should turn into the subsequent must–have ability for .NET builders. for additional info approximately LINQ, you could try out the author’s portal at www.LINQdev.com.

Pro LINQ: Language built-in question in C# 2008 is all approximately code.

Literally, this ebook begins with code and ends with code. In so much books, the writer indicates the best instance demonstrating the way to use a mode, yet they so hardly ever exhibit easy methods to use the extra complicated prototypes. Pro LINQ: Language built-in question in C# 2008 is diverse. Demonstrating the overpowering majority of LINQ operators and protoypes, it's a veritable treasury of LINQ examples.

Rather than imprecise the suitable LINQ rules in code examples by way of concentrating on an indication program you don't have any curiosity in writing, Pro LINQ: Language built-in question in C# 2008 cuts correct to the chase of every LINQ operator, approach, or category. even though, the place complexity is critical to really reveal a subject, the examples are correct there within the thick of it. for instance, code samples demonstrating easy methods to deal with concurrency conflicts truly create concurrency conflicts so that you can step in the course of the code and spot them unfold.

Most books let you know in regards to the easy stuff, whereas few books provide you with a warning of the pitfalls. the place Pro LINQ: Language built-in question in C# 2008 returns your funding is within the hours, and occasionally days, spent through the writer opting for why whatever won't paintings as anticipated. occasionally this leads to an blameless taking a look paragraph that can take you a minute to learn and comprehend, yet took days to investigate and explain.

Face it, so much technical books whereas informative, are boring. LINQ needn't be uninteresting. Written with a feeling of humor, Pro LINQ: Language built-in question in C# 2008 will try and entertain you in your trip during the wonderland of LINQ and C# 2008.

What you’ll learn

  • How to leverage the entire LINQ-relevant C# 2008 language positive factors together with extension equipment, lambda expressions, nameless facts varieties, and partial equipment.
  • How to take advantage of LINQ to things to question in–memory facts collections similar to arrays, ArrayLists, and Lists to retrieve the information you will have.
  • Why a few queries are deferred, how a deferred question can chew you, and the way you may make deferred queries give you the results you want.
  • How to exploit LINQ to XML to revolutionize your production, manipulation, and looking out of XML info.
  • How to question DataSets with LINQ to DataSet so that you can co–exist with legacy code and use LINQ to question databases except SQL Server.
  • How to question Databases with LINQ to SQL, write your personal entity sessions, and know the way to address concurrency conflicts.

Who this booklet is for

This booklet is written for the expert C# developer, yet you don't want to be up on the entire most modern C# good points to appreciate the cloth.

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LINQ is the venture identify for a suite of extensions to the . internet Framework that supply a prevalent method of querying info from diversified info resources. LINQ will premiere in visible Studio 2008, and may develop into the subsequent must–have ability for . internet builders. for additional information approximately LINQ, you could try out the author’s portal at www.

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Extra resources for LINQ : Language Integrated Query en C# 2008

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Cette simple ligne de code tire parti du mot-clé var, des types anonymes et de l’initialisation d’objets. Pour résumer, le mot-clé var permet de déduire le type d’un objet en tenant compte du type des données utilisées pour l’initialiser. Les types anonymes permettent donc de créer des types de classes à la volée. Comme le laisse prévoir le mot "anonyme", ces nouveaux types de données n’ont pas de nom. Il n’est pas simple de créer une donnée anonyme sans connaître ses variables membres, et vous ne pouvez pas connaître ses variables membres sans connaître leurs types.

Bien que les opérateurs OfType et Cast soient utilisables sur une collection héritée, Cast nécessite que tous les objets de la collection aient le type attendu. Pour éviter de générer des exceptions en cas d’incompatibilité de type, préférez-lui l’opérateur OfType. Par son intermédiaire, seuls les objets du type spécifié seront stockés dans la séquence IEnumerable, et aucune exception ne sera générée. Le cas échéant, les objets dont le type n’est pas celui attendu ne seront pas convertis. Les requêtes aussi peuvent être boguées Au Chapitre 3, vous verrez que les requêtes LINQ sont souvent différées.

Titre d’exemple, nous allons nous intéresser à deux implémentations différentes de l’opérateur Where. book Page 26 Mercredi, 18. Expression> predicate); Comme vous pouvez le voir, le premier opérateur Where accepte la méthode déléguée Func en argument. Du code IL sera donc généré par le compilateur pour l’expression lambda de cet opérateur. Reportez-vous au Chapitre 3 pour avoir plus d’informations sur le délégué Func. Pour l’instant, il vous suffit de comprendre que le délégué Func définit la signature de l’argument.

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